import java.util.ArrayList;
import java.util.HashMap;

/**
 * @author PC
 * @date 2020/5/15
 */


public class HashMapTest {
    public static void main(String[] args) {
        System.out.println("hello world");
        Object obj = new Object();
        boolean flag = obj.equals(new Object());
        HashMap<Integer,String> map = new HashMap<>(16);
        final String s = "jack";
        final Object o = new Object();
        ArrayList<Integer> list = new ArrayList<>();


    }
}
